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Positive-electrode active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery including the same

a technology of positive electrode active materials and secondary batteries, which is applied in the direction of nickel compounds, cell components, sustainable manufacturing/processing, etc., can solve the problems of poor battery performance, and achieve the effect of improving battery performance and lowering the activation voltage for initial charging

Active Publication Date: 2015-04-02
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent provides a positive-electrode material for a non-aqueous electrolyte secondary battery that can improve battery performance and lower the activation voltage for initial charging. This means that the battery will start working faster and at higher efficiency.

Problems solved by technology

However, the positive-electrode active material disclosed in Japanese Unexamined Patent Application Publication No. 2012-204281 requires a high activation voltage for initial charging and has poor battery performance.

Method used

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  • Positive-electrode active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery including the same
  • Positive-electrode active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery including the same

Examples

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example 1

Production of Lithium-Containing Transition Metal Oxide (Positive-Electrode Active Material)

[0070]Nickel sulfate (NiSO4), cobalt sulfate (CoSO4), and manganese sulfate (MnSO4) were mixed in an aqueous solution at a stoichiometric ratio of 0.13:0.13:0.74 and were coprecipitated to yield a precursor (Ni,Co,Mn) (OH)2. The precursor, sodium carbonate (Na2CO3), and lithium hydroxide monohydrate (LiOH.H2O) were mixed at a stoichiometric ratio of 0.85:0.74:0.15. This mixture was held at 900° C. for 10 hours to yield a sodium-containing transition metal oxide having the P2 structure. The main component of the sodium-containing transition metal oxide belongs to the space group P63 / mmc.

[0071]The composition of the sodium-containing transition metal oxide was analyzed with an inductively coupled plasma (ICP) emission spectrophotometric analyzer (Thermo Fisher Scientific, trade name “iCAP6300”). The analysis result was Na:Li:Mn:Co:Ni=0.756:0.145:0.625:0.115:0.115.

[0072]Five equivalents (25 g) o...

example 2

[0081]A coin-type battery 10 was manufactured in the same manner as in Example 1 except that the stirring time in the washing process in the manufacture of the lithium-containing transition metal oxide was 1 minute.

example 3

[0082]A coin-type battery 10 was manufactured in the same manner as in Example 1 except that 0.2 molar equivalent of lithium iodide was added to the product before ion exchange in the manufacture of the lithium-containing transition metal oxide.

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Abstract

A positive-electrode active material for a non-aqueous electrolyte secondary battery according to the present disclosure contains a layered lithium(Li)-containing transition metal composite oxide that contains Li in the transition metal layer and more than 0.4 μmol / g and less than 25 μmol / g of iodine (I) or bromine (Br).

Description

BACKGROUND[0001]1. Technical Field[0002]The present disclosure relates to a positive-electrode active material for a non-aqueous electrolyte secondary battery and a non-aqueous electrolyte secondary battery including the positive-electrode active material.[0003]2. Description of the Related Art[0004]A lithium-containing transition metal oxide that has been studied as one of next-generation positive-electrode active materials is produced by ion exchange of a sodium-containing transition metal oxide, belongs to the space group P63mc, and has the O2 structure. Such a lithium-containing transition metal oxide used as a positive-electrode active material is expected to have higher structural stability and capacity than lithium cobalt oxide (LiCoO2), which is practically used, belongs to the space group R-3m, and has the O3 structure. Japanese Unexamined Patent Application Publication No. 2012-204281 discloses a lithium-containing transition metal oxide that has the O2 structure and conta...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/1315H01M4/505C01B11/22H01M4/525
CPCH01M4/1315H01M4/525C01P2006/40C01B11/22H01M2004/028H01M4/505H01M4/1391H01M4/485H01M10/058C01B11/20C01G53/50C01P2002/50C01P2006/80Y02E60/10Y02P70/50
Inventor KAWADA, HIROSHI
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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